I see this being much like the Samsung Jay-Z release of Magna Carta Holy Grail.
Rihanna's "R Device" might not be an actual special edition iPhone (too expensive/risky), but maybe a specific app that allows special fan access and comes with album purchase, etc.
She's modern enough and tuned into social media and the digital sales world to pull this off.
We have to look at this from the music AND the business standpoint.
The only problem is that Rihanna fans don't like to pay for things.